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Search: id:A124821
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| A124821 |
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Number triangle T(n,k)=(-1)^(n-k)*(3k+2)*C(3n+1, n-k)/(2n+k+2). |
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+0
2
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| 1, -2, 1, 7, -5, 1, -30, 25, -8, 1, 143, -130, 52, -11, 1, -728, 700, -320, 88, -14, 1, 3876, -3876, 1938, -627, 133, -17, 1, -21318, 21945, -11704, 4235, -1078, 187, -20, 1, 120175, -126500, 70840, -27830, 8050, -1700
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Inverse of number triangle A124819. Row sums are (-1)^n*A001764(n).
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EXAMPLE
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Triangle begins
1,
-2, 1,
7, -5, 1,
-30, 25, -8, 1,
143, -130, 52, -11, 1,
-728, 700, -320, 88, -14, 1,
3876, -3876, 1938, -627, 133, -17, 1
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CROSSREFS
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Cf. A124019.
Sequence in context: A120872 A019642 A048505 this_sequence A104030 A082791 A077230
Adjacent sequences: A124818 A124819 A124820 this_sequence A124822 A124823 A124824
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KEYWORD
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easy,sign,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Nov 08 2006
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